Tag Archives: underwater video

Deep-sea fishes survey off Kaikoura: it’s a go! (3 days before departure)

The start of a new sampling campaign is always a very exciting moment for scientists. After months of careful preparations, our fourth deep-sea sampling station is becoming a reality.

In three days, Carl, Tom and myself from Te Papa are joining our boat the Star Keys, her crew and two other scientists from Massey University for 7 days at sea. In three days, we will be sampling in deep waters off Kaikoura! Once again, we will be using video equipment and deep-sea fish traps. Similarly to what we have done in the past, we are going to deploy this scientific equipment at depth ranging from 50 to 1200 m to study diversity patterns of New Zealand fish fauna.

Scientists preparing video unit before its deployment at 1200 m depth. March 2010, Three Kings Islands. Te Papa, photograph by Vincent Zintzen

Scientists preparing video unit before its deployment at 1200 m depth. March 2010, Three Kings Islands. Te Papa, photograph by Vincent Zintzen

 

For the first time, our sampling site is located in the South Island. A guarantee for exciting discoveries! In the past year, we have worked off White Island, Great Barrier Island and the Three Kings Islands, which are all located North of Wellington. Those sites, just like Kaikoura, are particularly adapted to our sampling approach because the slope of the seabed  is very steep. It is then easy and fast to travel from one sampling station to another. Imagine, off Kaikoura, to go from a 100 m to 900 m depth, you only have to travel about 2 km on the sea surface. Steeper than the steepest hills in Wellington (and I am a cyclist, I know they can be steep…).

We should have a pretty good internet connection so that I will be able to post some news about how our work is progressing.

In the meantime, have a look at those videos from our past trips which show you the kind of amazing fish diversity New Zealand has to offer.

Speak to you soon,

Vincent

Deep-sea fishes and coral garden discovered at the Three Kings Islands

Aquarium like scenery, deep-sea coral and sponge gardens (an extremely rich and rare habitat), hungry groupers and sharks, as well as a frenzy of deep-sea eel-like creatures: the Three Kings Islands have it all for you.

In April 2010, a team of five scientists from Te Papa and Massey University have been carrying research for about a week around the Three Kings Islands. These isolated stacks of rocks are located about 50km North of Northland and are stunning place to work. In addition to a feeling of being at the end of the world, this place is special for marine scientists because it is at the intersection of different water masses, concentrating an extremely diverse underwater fauna.

Our objectives were to study the fish fauna of the area, at depth ranging from 50 to 1200m. Quite a challenge, considering this place is exposed to bad weather and is famous for the strength of its tidal currents. These can be so strong that they often submerge the surface buoys which are attached to gear, making them impossible to find till they pop up again when tides slacken. A stressful time…

I probably lost hair during the week because of this, but in the end, everything ran smoothly and we deployed our video systems over 50 times, capturing some very neat footage. I have been reviewing them here in the lab and wanted to share some of the interesting sections with you.

One of the highlight of the fieldwork was the discovery of extended deep-sea coral and sponge gardens at depths ranging from 300 to 700m. This complex habitat is composed of a mixture of coral species that are adapted to the deep-sea conditions, i.e. they do not need light like their shallow-water associated species to thrive. Although poorly studied, we know that those habitats are rare, fragile and harbour a significant amount of biodiversity. They can also be important spawning and nursery grounds for many fish species. Seeing this habitat for the first time with such clear video images was soul-stirring for the team.

Coral garden Three Kings

If you want to know more about this project, you can visit the home page of the fish team.

Vincent Zintzen, Te Papa researcher.

Impressive deep-sea shark filmed during White Island survey

As research scientist for the Marsden funded project on diversity of deep-sea fishes of New Zealand, I have to analyse hundreds of hours of video footage taken during our surveys. Sometimes, amazing creatures appear on the screen, often when you least suspect it. Here is a shot that really surprised me. I virtually stepped back about a meter from my screen when a large sand tiger shark (Odontaspis ferox Risso, 1810) first swam towards me.

This is a large female, close to 400 cm in length. The species is a rare one, although it has been reported from scattered localities around the world. The sensors attached to our video system recorded a depth of 880 m, exactly the same depth as the deepest known record for the species. However, this species is sometimes spotted at scuba diving depths.

You will have noticed that we are using blue light to illuminate our footage. Indeed, at 880 m depth, there is no natural light or rather I should say no light that can be seen by a human eye. There is still a little bit of light that some deep sea organisms can use to find their prey. We are using blue LED systems because it appears that most fish species that we are interested in cannot see this kind of light. Because our light source is invisible to fishes, they are not disturbed and behave naturally in front of the camera, making our observations more accurate.

More amazing species from the deep to come later! Right now, I have started to process videos from recent fieldwork around Great Barrier Island and Three Kings Islands. In the meantime, you can learn more about our project by visiting the Te Papa Fish Team website.

Te Papa scientists recovering a video unit sent underwater to film deep-sea fish life.

Te Papa scientists recovering a video unit sent underwater to film deep-sea fish life. Note the bait bag at the front which is used to attract the fish towards the camera and the blue light at the top of the frame.

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